but it doesn’t work. Is my synthax wrong, or isn’t it possible at all?
I’d like to talk to the thispatcher of a parent without the need of
actually instantiating a thispatcher object and giving it a name.

The concrete issue is a defocusing. Thus if there would be a way to
defocus with a scripting command, this would make me happy as well.
Though the possibility to talk to a parent patcher directly is on my
wishlist for a long time.

Sorry, there’s currently no way to do this from the toplevel patcher
(your patch works in a subpatch, although the name has to be
parent::somebox).

The pattrforward object speaks to boxes, and your parent patcher, in
this case, has none. Because I was so mean to you yesterday, though,
I’ve added this feature for the next release of the object. The name of
the pattrforward object’s containing patcher will be "this". And "this"
will work at any patcher level.

Until then, you’ll need to talk to the patcher through a thispatcher
object or use JavaScript to do this.